diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-3.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-3.C
index 99d4c38895d..12c4c453e1a 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-3.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-3.C
@@ -1,5 +1,7 @@
 // PR c++/70001
-// { dg-do compile { target c++11 } }
+
+// This is still slow to compile, only run it once.
+// { dg-do compile { target c++14_only } }
 
 #include <array>
 #include <complex>
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-4.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-4.C
index c1ab1765b3e..5c4a4add00d 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-4.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-70001-4.C
@@ -1,5 +1,7 @@
 // PR c++/70001
-// { dg-do compile { target c++11 } }
+
+// This is still slow to compile, only run it once.
+// { dg-do compile { target c++14_only } }
 
 struct B
 {